We start by reading in the following required libraries:
library(readr)
library(ggplot2)
library(dplyr)
library(methods)
library(stringi)
library(keras)
We use ResNet50, which is a pre-trained neural network model with 50 trainable layers. We want to use the second last layer in the neural network (‘avg_pool’):
resnet50 <- application_resnet50(weights = 'imagenet', include_top = TRUE)
model_embed <- keras_model(inputs = resnet50$input,
outputs = get_layer(resnet50, 'avg_pool')$output)
Here, we import the data for all the flower images from the following .csv and .rds files:
flowers <- read_csv("my-image-data.csv")
## Parsed with column specification:
## cols(
## obs_id = col_character(),
## train_id = col_character(),
## class = col_integer(),
## class_name = col_integer(),
## path_to_image = col_character()
## )
x69 <- read_rds("my-image-embed.rds")
Here, we produce the embeddings:
X <- t(apply(x69, 1, cbind))
y <- flowers$class
class_names <- levels(factor(flowers$class_name))
Then, we construct the training dataset using the data we have in ‘flowers’ (which we created using a 60/40 split for training and validation data respectively):
X_train <- X[flowers$train_id == "train",]
y_train <- to_categorical(flowers$class[flowers$train_id == "train"])
Just to get an idea of what kind of images and their respective classes we’re looking, we print 1 sample image1 each of 18 different classes.
set.seed(1)
par(mfrow = c(3, 3))
sample_size = 18
for (j in seq_len(sample_size)) {
id <- sample(which(y == j), 1)
for (i in id) {
par(mar = rep(0, 4L))
plot(0,0,xlim=c(0,1),ylim=c(0,1),axes= FALSE,type = "n")
Z <- image_to_array(image_load(flowers$path_to_image[i], target_size = c(224,224)))
rasterImage(Z /255,0,0,1,1)
text(0.5, 0.1, label = flowers$class_name[y[i] + 1L], col = "red", cex=2)
}
}
With the dataset created above, we use a neural network as the model to fit on our data (using 20 epochs). The plot shows the loss as well as the accuracy with respect to number of epochs.
model <- keras_model_sequential()
model %>%
layer_dense(units = 256, input_shape = ncol(X_train)) %>%
layer_activation(activation = "relu") %>%
layer_dropout(rate = 0.5) %>%
layer_dense(units = 256) %>%
layer_activation(activation = "relu") %>%
layer_dropout(rate = 0.5) %>%
layer_dense(units = ncol(y_train)) %>%
layer_activation(activation = "softmax")
model %>% compile(loss = 'categorical_crossentropy',
optimizer = optimizer_rmsprop(lr = 0.001 / 2),
metrics = c('accuracy'))
history <- model %>% fit(X_train, y_train, epochs = 20)
plot(history)
The model fits almost perfectly for the training set (with an accuracy of around 99.5%) and quite well with the validation set (with an accuracy of around 92.7%)
y_pred <- predict_classes(model, X)
tapply(y == y_pred, flowers$train_id, mean)
## train valid
## 0.9973561 0.9297066
Here, we print the confusion matrix, which shows the actual value (of the class name) as compared to the predicted value for both the training and validation data sets. Each predicted value should ideally only correspond to a number of matches for the same actual value. Any matches with an actual value that is different means a case of ‘confusion’, or inaccurate prediction.
table(value = class_names[y + 1L], prediction = class_names[y_pred + 1L], flowers$train_id)
## , , = train
##
## prediction
## value 0 1 10 100 101 11 12 13 14 15 16 17 18 19 2 20 21
## 0 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 1 0 36 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 10 0 0 52 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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## prediction
## value 22 23 24 25 26 27 28 29 3 30 31 32 33 34 35 36 37
## 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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## 11 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 12 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 13 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 14 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 17 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 18 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 19 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 21 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 22 55 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 23 0 25 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 24 0 0 25 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 25 0 0 0 24 0 0 0 0 0 0 0 0 0 0 0 0 0
## 26 0 0 0 0 24 0 0 0 0 0 0 0 0 0 0 0 0
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## 3 0 0 0 0 0 0 0 0 33 0 0 0 0 0 0 0 0
## 30 0 0 0 0 0 0 0 0 0 31 0 0 0 0 0 0 0
## 31 0 0 0 0 0 0 0 0 0 0 26 0 0 0 0 0 0
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## 33 0 0 0 0 0 0 0 0 0 0 0 0 24 0 0 0 0
## 34 0 0 0 0 0 0 0 0 0 0 0 0 0 26 0 0 0
## 35 0 0 0 0 0 0 0 0 0 0 0 0 0 0 45 0 0
## 36 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 65 0
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## prediction
## value 38 39 4 40 41 42 43 44 45 46 47 48 49 5 50 51 52
## 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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## 99 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## prediction
## value 53 54 55 56 57 58 59 6 60 61 62 63 64 65 66 67 68
## 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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## 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
## 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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The following allows us to find those examples that have the highest probability of being in a class. We use predict(mode, X) to get the probabilities and then show images that had the highest classification rate, along with their predicted class names:
set.seed(1)
par(mfrow = c(2, 3))
y_pred_mat <- predict(model, X)
id <- apply(y_pred_mat, 2, which.max)
for (i in id) try({
par(mar = rep(0, 4L))
plot(0,0,xlim=c(0,1),ylim=c(0,1),axes= FALSE,type = "n")
Z <- image_to_array(image_load(flowers$path_to_image[i], target_size = c(224,224)))
rasterImage(Z /255,0,0,1,1)
text(0.5, 0.1, label = flowers$class_name[y_pred[i] + 1L], col = "red", cex=2)
})